Kazuyoshi Ishii (石井 和義) Ishii Kazuyoshi is a Japanese master of Seidokaikan karate and founder of the K-1 fighting circuit, a widely televised international martial arts competition combining Muay Thai, karate, sanshou, taekwondo, kenpo, boxing, and kickboxing. His karate training began with Kyokushin karate, but he formed his own karate organization in 1980, began promoting